1. How to Set Up a Color Palette for Your Effect

Step 1

You can create your document at any size, but to match the dimensions specified here, set the Page Size to A3 and orientation to Landscape. Deselect Facing Pages. Click Create.

With the rulers visible (View > Show Rulers), drag a guide down from the top ruler to Y position 111 mm and a second to 186 mm.

Step 2

From the left-hand ruler, pull out a guide to X position 47 mm and a second to 82.5 mm.

Select both guides and Edit > Copy, Edit > Paste, moving the pasted pair over to the right, allowing the left-hand guide to overlap the original 82.5 mm guide. This will create a trio of guides, with two equal columns.